Device for rolling corrugated tubular parts

ABSTRACT

A device for rolling corrugated tubular parts, in which there is provided a row of series arranged passes formed by toothed rolls with at least the first of the passes in the direction of rolling being effected with driven toothed rolls.

United States Patent [191 Zhukevich-Stosha et al.

[ 51 Mar. 27, 1973 DEVICE FOR ROLLING CORRUGATED TUBULAR PARTS [22]Filed: Dec. 3, 1970 [21] Appl. No.2 94,745

[52] U.S. CI ..72/187, 72/194 [51] Int. Cl. ..B21d 15/06 [58] Field ofSearch..l.....72/77, 78, 98, 99, 100, 187,

[56] References Cited UNITED STATES PATENTS 2,757,706 8/1956 Johnston..72/96 Primary Examiner-Lowell A. Larson Attorney-Holman & Stern [57]ABSTRACT A device for rolling corrugated tubular parts, in which thereis provided a row of series arranged passes formed by toothed rolls withat least the first of the passes in the direction of rolling beingeffected with driven toothed rolls.

3 Claims, 7 Drawing Figures PATENTEDHARZYISTS sum HP 3 f 3 111 f I H mmMa 0 g 4 '2 m 13 I4 I I 7 6 HL 11 12 .gi M 11 u DEVICE FOR ROLLINGCORRUGATED TUBULAR PARTS BACKGROUND OF THE INVENTION The presentinvention relates to devices for rolling corrugated tubular parts to beused, for instance, as sheathing for cables.

PRIOR ART Prior art corrugating devices are known which comprise a passformed by toothed rolls, and through which tubular blanks are forced.

When corrugating by longitudinal rolling in a toothed roll pass providedwith a round passage opening, outer wrinkles are formed on the surfaceof the blank at the places of contact with butt joint areas of twoadjacent rolls, and such wrinkles are caused by the roll tooth edgespinching portions of the outer surface of the blank. This is due to thefact that, in the case of a round passage opening of a pass whosediameter is less than that of the blank, the penetration of the toothedrolls into the blank is initiated by the sharp edges of the teeth.

With a view to eliminating the outer wrinkles, in the known devices,provision is made of an inlet arrangement provided with adjustablesmoothing members with whose aid longitudinal grooving is effected onthe blank in the places of wrinkle formation, and as a result of whichthe wrinkles on the corrugated surface are pressed inwardly.

It should be noted that corrugated sheathings with inner wrinklesfeature low plasticity and find no practical application.

As to forcing the blank through the toothed roll pass, thepotentialities of the device are limited by the condition of thebuckling strength of the parts being corrugated and of the compressionstrength during the blank contact with the toothed surface of the rolls.This rules out the possibility of using the known devices forcorrugating parts made of a soft metal and featuring a small diameterand wall thickness.

It is an object of our invention to provide a corrugating device which,regardless of the diameter-to-wall thickness ratio of the tubular blank,attains a corrugation of any depth featuring no wrinkles orindentations, as well as for the axial displacement of the blank withinthe device without using any additional mechanisms.

SUMMARY OF THE INVENTION .of the passes in the direction of rollingbeing defined by driven toothed rolls, with the curvature radii of theirconcave toothed surfaces being greater than the radius of a circleinscribed in the pass, and each subsequent pass with respect to thepreceding pass being turned about the axis of rolling through an angleinsuring the mutual overlapping of butt joint portions of the rollsforming the passes.

In the specific embodiment of the device, the passage cross-sectionareas of the passes decrease in the direction of rolling.

In the present device, the corrugation can be effected without wrinklesand indentations owing to the fact that the initial pressing of theblank is effected by the middle portions of the teeth and not by theedges.

When corrugating with the present device, no additional mechanisms arerequired for effecting the axial displacement of the blank for thefunctions of such mechanisms are performed by the corrugating toothedrolls rotated from a drive, which provides for corrugating thin-walledtubular parts of a small diameter and unlimited length.

Presented hereinbelow is a detailed description of an exemplaryembodiment of the present invention with reference to the accompanyingdrawings, wherein:

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 view in side elevation of acorrugating device according to the present invention:

FIG. 2 is a view taken along the line lI-II of FIG. 1, the view lookingin the direction of the arrows;

FIG. 3 is a view taken along the line III-III of FIG. 1, the viewlooking in the direction of the arrows;

FIG. 4 shows diagrammatically the manner in which a tubular part to becorrugated is rolled; and,

FIGS. 5a, 5b, 5c illustrate diagrammatically passage openings of thepasses.

DETAILED DESCRIPTION OF THE DRAWINGS Referring to FIG. 1, a frame 1 ofthe device mounts one or several stands 20, 2b. Each stand 2a, 2bincludes a housing 3 on whose side walls are arranged, with apossibility of setting displacement, three carriages 4 provided withbuilt in reducing gears 5 as shown in FIG. 2.

The setting displacement of the carriages 4 relative to the housing 3 ofthe stands 2a, 2b, as well as their locking in place, is effected bymeans of screws 6.

Secured on output shafts 7 of the reducing gears 5 are rolls 8 havingconcave toothed working surfaces. The toothed rolls 8 coact to formpasses whose passage openings are set and adjusted by means of thescrews 6 due to the displacement of the carriages 4 on the housing 3 ofthe stands 2a, 2b.

Input shafts 9 (FIGS. 1 and 3) of the reducing gears 5 are connected toeach other and to output shafts 10 of a distributing reducer 11 by meansof toothed couplings 12. By means of an analogous coupling 12, an inputshaft 13 of the distributing reducer 11 is connected to a shaft 14 of anelectric motor 14a.

The passes of the device formed by the toothed rolls 8, which are shownin detail in FIG. 4, are turned relative to each other so that the buttjoint portions of two adjacent rolls 8 mutually overlap in eachsubsequent pass with respect to the preceding pass in the direction ofthe common axis of the passes.

As shown in FIGS. 5a and 5b, the curvature radii of the concave toothedsurfaces of the rolls 8 forming each of the passes are greater than theradius of a circle inscribed in the pass, with the exception of the lastpass in the direction of rolling and which last pass is illustrated inFIG. 50.

The present device operates inthe following manner:

Depending upon the diameter of the tubular parts to be corrugated, inthe device are placed stands whose passes correspond to a specificrolling, that is, the gage of the passes depends upon the blankdiameter. The rotation from the electric motor 141: (FIG. 1) istransmitted via the shafts 14 and 13, distributing reducer 1 l andreducing gears 5 to the toothed rolls 8.

A tubular blank shown in FIG. 4 is moved to the first toothed roll passof the stand 2a whose rolls 8 engage the tubular blank 15 and roll thelatter forming on its surface corrugation recesses which, in thecross-sectional plane have the shape of a passage opening 16 (FIG. 5a).

Upon further movement, the blank 15 passes the second pass of the stand2a after which the corrugation recesses in the cross-sectional planeacquire the shape of a passage opening 17 (FIG. 5b). The passagecrosssection areas of the passes decrease in the direction of rolling.

The blank 15 is then upset in the passes of the stands until the desireddepth of corrugation is attained. The last pass of stand 2b has apassage opening in the form of a circle 18 (FIG. 5c) and whose diametercorresponds to the required diameter of corrugation recesses.

What we claim is:

1. A device for rolling corrugated tubular parts, comprising a row ofseries-arranged passes, each pass being defined by a plurality of rolls,the rolls of each pass being arranged to encircle the part being rolledaround it's entire periphery, said rolls having concave toothed workingsurfaces, at least the first of said passes in the direction of rollingbeing defined by driven toothed rolls, the curvature radii of whoseconcave surfaces are greater than the radius of a circle inscribed inthe pass, and each subsequent pass with respect to the preceding passbeing turned about the axis of rolling through an angle insuring themutual overlapping of butt joint portions of the rolls defining thepasses.

2. The device as set forth in claim 1, wherein the passage cross-sectionareas of the passes decrease in the direction of rolling.

3. The device as set forth in claim 2, including means for adjusting therelative position of the rolls of each pass.

1. A device for rolling corrugated tubular parts, comprising a row ofseries-arranged passes, each pass being defined by a plurality of rolls,the rolls of each pass being arranged to encircle the part being rolledaround it''s entire periphery, said rolls having concave toothed workingsurfaces, at least the first of said passes in the direction of rollingbeing defined by driven toothed rolls, the curvature radii of whoseconcave surfaces are greater than the radius of a circle inscribed inthe pass, and each subsequent pass with respect to the preceding passbeing turned about the axis of rolling through an angle insuring themutual overlapping of butt joint portions of the rolls defining thepasses.
 2. The device as set forth in claim 1, wherein the passagecross-section areas of the passes decrease in the direction of rolling.3. The device as set forth in claim 2, including means for adjusting therelative position of the rolls of each pass.